Xu, G, Halioua, Y, Colombelli, R et al. (6 more authors) (2013) Phase-locking of surface-emitting THz quantum cascade laser arrays. Proceedings of SPIE - The International Society for Optical Engineering, 8631. ISSN 0277-786X
Abstract
We first discuss and review a novel technique to obtain efficient surface-emission in terahertz quantum cascade lasers (THz-QCLs). We report high-power, single-mode surface-emission by using graded photonic heterostructures (GPH) as resonators. Peak output powers of ∼100 mW and differential efficiency of 230mW/A are achieved at frequency ∼ 3.4THz, the maximum operation temperature being 120K in pulsed mode. Combining with the active region based on the bound-to-continuum design, we also achieved continuous-wave (CW) operation of GPH THz QC lasers, with the maximum output power of 3.8 mW at 2.7THz. We then discuss the prospects to develop phase-locked arrays of these devices, in order to take advantage of their good wall-plug efficiency (<0.3%) and single-lobed directional beam pattern. As an initial result, a very robust approach to phase-lock second-order distributed feedback (DFB) THz QC laser arrays (pairs in this case) is demonstrated.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | Mode locking; Quantum cascade lasers; Terahertz radiation; Resonators; Continuous wave operation; Feedback; Heterojunctions |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 09 Jul 2014 11:39 |
Last Modified: | 09 Jul 2014 11:39 |
Published Version: | http://dx.doi.org/10.1117/12.2004125 |
Status: | Published |
Publisher: | International Society for Optical Engineering |
Identification Number: | 10.1117/12.2004125 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:79603 |